Incoming President Donald J. Trump is set to use his first hours in office to reverse some of his predecessor's highest-profile policies.

Even before he begins dismantling the Affordable Care Act and building a wall on the border with Mexico, Trump has promised to immediately roll back executive actions signed by President Barack Obama to shield immigrants from deportation and impose a hiring freeze on the federal government.

Conservative and business groups hope the Republican goes even further by repealing a number of Obama-era orders and agency regulations that affect how much federal contractors must pay employees and whether they must disclose labor law violations.